I've never seen that happen myself. I've got arrows that have been in the bucket literally years and haven't cracked, with the points broken off. I put all my culls in a 5 gallon bucket in the basement, and my buddys go through them on a regular basis and get what they can use. I use a full-length wood shaft, so when it breaks it still has some life in it for most folks, just not for me. Most likely the damage was done and just didn't show up as much until they had sit there a while and maybe absorbed a little moisture to open up the cracks. That's just a guess though. With wood arrows, always give them the roll, especially after a bad hit or slap. Caught one for a friend just yesterday--it looked just fine, but I don't think he could have gotten away with shooting it again--a mild flex snapped it. He's a believer in checking them now!

Chad